James duffy



(No Model.)

J. DUFFY.

TUBE BXPANDBB.

No. 383,111. Patented May 22, 1888.

UNITED STATES PATENT Ormes.,

JAMES DUFFY, OF BUFFALO, NEV YORK.

TUeEfExPANDsR.

SPECIFICATION forming part or' Letters Patent No. 383.111, dated May ,22. 1889- Application iiled September 1, 1857-. Serial No. 248,439. (No model.)

To @ZZ whom it 11ml/ concern:

Be it known that I, JAMES DUFFY, of the city of Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Tnbe-Expanders, of which the following is a specification.

This invention relates to improvements in that class of tube-expanders which consist of a stock or holder in which a series of pressure or swaging rollers are arranged, which are forced outwardly against the tube by a tapering plug or mandrel inserted into the holder.

The object of my invention is to simplify the construction of the tube-expander and to provide the same with an adjustable bearing-piece, which rests against the tube-sbeet,and whereby the tool can be used in connection with tubesheets of different thicknesses.

Theinvention consists of the improvements, which will be hereinafter fully set forth, and pointed out in the claim.

In the accompanying drawings, Figure l is a side elevation of myimproved tube-expander applied to the end of a tube, the tube and a portion of the tube-sheet being shown in section. Fig. 2 is a sectional elevation of the same. Fig. 3is an elevation of one of the pressure-rollers and beading-roller. Fig. 4 is a cross-sectionin linew, Fig. l. Fig. 5 isaside elevation of tbestook or holder with the pressnrerollers and connecting parts removed therefrom.'

Like letters of reference refer to like parts in the several figures.

Arepresents the cylindrical stock or holder, which is composed of an inner ring, a, an outer ring, a', and longitudinal .connecting-ribs c2, formed in one piece.

co3 represents longitudinal openings formed between the ribs c2, and B represents the pressure orswaging rollers arranged in the openings c, and which are composed of two separate parts, l) b. llhe part b is cylindrical in form and adapted to bear against that portion of the tube resting in the opening of tbe tubesheet. The part b of the roller is also cylindrical and provided at one end with a projecting rim, b2, which is adapted to form a bead on the tube on the inner side of the tube-sheet. By constructing the pressure-rollers in two sections in this manner the part b can be removed from the holder when it is desired to expand the end of the tube without forming a bead on the same.

The openings c3 are made tapering from their inner toward their outer ends, as shown in Fig. 4, and are made of such a size as to per'- mit a portion of the rollers B to project through the inner ends ofthe openings into the bore of t-he holder without, however, allowing the rollers to drop through the openings.

C represents flat or sligbtly-curved springs, which are secured by screws c to the ribs ci of the holder A, and which are seated in depressions c', formed inthe ribs a2, so as to stand ush with or below the face ofthe holder. The

`springs G project beyond the edges of the ribs a2 and partly cover the openings ai', so as to retain the rollers B in the openings, as shown in Fig. 4. The rollers B areinserted into the openings a from the outer sides of the holder, and the springs C are then secured in place. The springs O extend from end to end of the pressure-rollers, as shown in Fig. l, so as 'to cover the ends of the openings a3 and prevent dirt, dac., from entering the bore of the holder and interfering with the free operationof the tool.

D represents the tapering plug or mandrel, which is inserted into the bore of the holder A, and which bears against the inner portions of the rollers B. The plug Dis provided at its outer end with a head, d, having an opening, d', in which is inserted a bar or handle for turning the plug.

E represents an adjustable bearing-piece, which is arranged upon a hub, c, formed ou the outer end of the holder A and resting against the outer side of the tube sheetf. The bearn ing-piece E consists of a ring, e, ,which surrounds the hub e, and two inwardly-projectiug legs, c?, formed on diametrically-opposite sides ofthe ring e and bearing with their inner ends against the tube-sheet.

H represents a split clamping ring or collar secured to the hub e of the holder in front of the bearing-piece E and bearing against the latter. The ring H is provided with a clamping-bolt, h., which passes through the split ends of the ring. Upon loosening the clampingring H the bearing-piece E can be adjusted on the hub of the holder A so as to permit the holder to project into the tube a greater or less distance, as may be required by the thickness lOO ofthe tube-sheet. "When the bearing-pieceA has been adjusted, it is held in place by tightening the clamping-ring I-I.

By providing the holder with an adjustable bearing-piece the same can be employed for expanding tubes which are seated in tubesheets of varying thickness, thereby dispensing with the use of separate holders for operating upon different-sized tubesheets.

In using my improved tool the holder A, with the plug or mandrel D removed therefrom, is inserted into the end of the tube, and the bearing-piece E is adjusted so that the holder projects into the tube the proper distance. The mandrel is then inserted into the bore of the holder and turned and at the same time forced inwardly. The mandrel comes first in Contact with the bead of the beadingroller b', which bead is somewhat larger in diameter than the face of the main swagingroller b and projects inwardly farther than the face of the main swagng roller. The mandrel forces the beading-roller b outwardly before it moves the main swagingroller b outwardly, thereby forming the bead partly before pressure is applied to the main swaging-roller. After the beading-roller b has been forced out far enough to bring the mandrel in Contact with the faee of the main swaging-roller, as represented in Fig. 2, the pressure is applied to the face of the main swaging-roller also, and

in the further operation of the tool both the main swaging-roller and beadingroller are forcedoutwardly together. In this manner the beading-roller operates somewhat in ad- Vance of the main swaging-roller, and when the pressure is applied to both of these rollers a large part of the pressure is directly applied to the face of the main swagng-roller and not solely to the bead of the beading-roller, as would be the oase if the beading and swaging rollers were formed in one piece. By this means a tighter joint is produced between the tube and the part into which the tube is expanded. Upon withdrawing the mandrel from the holder the springs C force the rollers B inwardly to their former position and permit the holder to be removed from the tube.

I claim as my inventionM The Combination, with the holder A, proi vided with a series of tapering openings, a3, of the pressure or swaging rollers B, arranged in said openings, and springs C, secured to the holder and paltly covering said openings, whereby the rollers are retained in the openings, substantially as set forth.

Witness my hand this 23d day of August, 1887.

JAMES DUFFY. Titnessesz CARL F. GEYER, F. C. GEYER. 

